Pension and Other Postretirement Benefit Plans Schedule of Amounts Recognized in Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Deferred tax asset	$ 52,190	$ 39,974
OTHER LONG-TERM LIABILITIES	27,985	33,173
Accumulated other comprehensive income (loss)	(7,200)	(6,330)
Dutch Plan
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Deferred tax asset	1,192	1,482
OTHER LONG-TERM LIABILITIES	4,364	5,928
Accumulated other comprehensive income (loss)	$ (5,375)	$ (5,640)